From owner-freebsd-threads@freebsd.org Sat Jan 7 16:06:14 2017 Return-Path: Delivered-To: freebsd-threads@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 23F1BCA4BE5 for ; Sat, 7 Jan 2017 16:06:14 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id EE8F71768 for ; Sat, 7 Jan 2017 16:06:13 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v07G6D3K064895 for ; Sat, 7 Jan 2017 16:06:13 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-threads@FreeBSD.org Subject: [Bug 215709] Use of thread_local produces linking errors [now with gcc] Date: Sat, 07 Jan 2017 16:06:13 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: threads X-Bugzilla-Version: 11.0-RELEASE X-Bugzilla-Keywords: patch X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: commit-hook@freebsd.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-threads@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-threads@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Threading on FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 07 Jan 2017 16:06:14 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D215709 --- Comment #6 from commit-hook@freebsd.org --- A commit references this bug: Author: kib Date: Sat Jan 7 16:05:19 UTC 2017 New revision: 311651 URL: https://svnweb.freebsd.org/changeset/base/311651 Log: Export __cxa_thread_atexit_impl as an alias for __cxa_thread_atexit. libstdc++ before gcc r244057 expected that libc provided __cxa_thread_atexit_impl, and libstdc++ implemented __cxa_thread_atexit, by forwarding the calls to _impl. Mentioned gcc revision checks for __cxa_thread_atexit in libc and does not provide the symbol from libstdc++ if found. This change helps older gcc, in particular, all released versions which implement thread_local, by consolidating the implementation into libc. For that versions, if configured with the current libc, the __cxa_thread_atexit is exported from libstdc++ as a trivial wrapper around libc::__cxa_thread_atexit_impl. The __cxa_thread_atexit implementation is put into separate source file to allow for static linking with older libstdc++.a. gcc bugzilla: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D78968 Reported by: Hannes Hauswedell PR: 215709 Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Changes: head/lib/libc/include/libc_private.h head/lib/libc/stdlib/Makefile.inc head/lib/libc/stdlib/Symbol.map head/lib/libc/stdlib/cxa_thread_atexit.c head/lib/libc/stdlib/cxa_thread_atexit_impl.c --=20 You are receiving this mail because: You are the assignee for the bug.=